Merge pull request #11752 from Attila96/feature/bael-5317_current_trace_id_spring_cloud_sleuth

[BAEL-5317] Get current trace ID in Spring Cloud Sleuth

spring-sleuth/pom.xml

@@ -39,7 +39,7 @@
     </dependencies>
 
     <properties>
-        <spring-cloud-sleuth.version>2.0.2.RELEASE</spring-cloud-sleuth.version>
+        <spring-cloud-sleuth.version>3.1.0</spring-cloud-sleuth.version>
     </properties>
 
 </project>

spring-sleuth/src/main/java/com/baeldung/sleuth/traceid/SleuthCurrentTraceIdApp.java

@@ -0,0 +1,11 @@
+package com.baeldung.sleuth.traceid;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SleuthCurrentTraceIdApp {
+    public static void main(String[] args) {
+        SpringApplication.run(SleuthCurrentTraceIdApp.class, args);
+    }
+}

spring-sleuth/src/main/java/com/baeldung/sleuth/traceid/SleuthTraceIdController.java

@@ -0,0 +1,32 @@
+package com.baeldung.sleuth.traceid;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import brave.Span;
+import brave.Tracer;
+
+@RestController
+public class SleuthTraceIdController {
+
+    private static final Logger logger = LoggerFactory.getLogger(SleuthTraceIdController.class);
+
+    @Autowired
+    private Tracer tracer;
+
+    @GetMapping("/traceid")
+    public String getSleuthTraceId() {
+        logger.info("Hello with Sleuth");
+        Span span = tracer.currentSpan();
+        if (span != null) {
+            logger.info("Span ID hex {}", span.context().spanIdString());
+            logger.info("Span ID decimal {}", span.context().spanId());
+            logger.info("Trace ID hex {}", span.context().traceIdString());
+            logger.info("Trace ID decimal {}", span.context().traceId());
+        }
+        return "Hello from Sleuth";
+    }
+}